Kathy knows that 1,894 years are supposed to pass and that her and River are in a time loop. Thank goodness that it actually doesn't feel like that long though Kathy can feel the time loop and is sort of aware of it happening but can't really recall how many times or what she was doing.

Due to the TARDIS exploding, everything in the sky would've gone. Rory had likely killed/harmed Amy unintentionally so she would have been placed in the Pandorica where the Doctor had been so that little her 1,894 years in the future could revive her, which coincidentally revives a Dalek.

Kathy connects the wires as the TARDIS continues to spark and explode. River opens the doors to the TARDIS only to be met by a stone wall.

"I'm sorry, my love." River looks back over her shoulder, to Kathy, who stands in the steps, as the console explodes with a bright light.

The sequence starts over again and Kathy finds herself going through the motion of connecting the wires feeling like she had been doing this before. The knowledge that they must be going through the time loop that happened at the beginning of the episode kept her sane. But this time as River runs to the door, the Doctor appears.

"Hi, honey. I'm home." He casually says leaning against the door with a fez on his head.

River looks at her watch. "And what sort of time do you call this?"

"Tell me about it!" Kathy yells from behind them.

—

The Doctor uses River's time vortex manipulator and they appear on the roof of the museum to find Amy and Rory in front of them.

"Amy! And the plastic Centurion?" River greets. Kathy commends her acting talent for acting like she's never met her father before.

"It's OK, he's on our side." The Doctor reassures. "Kathy could tell you that."

"Yep."

"Really? I dated a Nestene duplicate once... swappable head, it did keep things fresh." River says.

Kathy lets out a snort. "Seriously?"

"What? So did you!" Kathy gapes at her. Jesus, what will she get up to?

"Spoilers!"

Rory waves awkwardly. "Hi Kathy."

Kathy waves back. "Hi Rory, never met you before but hi."

Rory frowns. "You haven't?"

"Nope!"

River claps her hands together. "Right then, I have questions. But number one is this... What in the name of sanity have you got on your head?"

"It's a fez. I wear a fez now. Fezzes are cool." The Doctor remarks as if it's obvious, which it is.

Kathy grins. "Very cool."

With a look from River, Amy grabs the fez from the Doctor's head and throws it into the sky and River shoots it before Kathy can stop her.

"Oh!" The Doctor cries.

"Seriously?!" Kathy exclaims at the same time.

"Exterminate!" A Dalek appears, levitating up the side of the building.

"Run, run, move, move. Go! Come on!" The Doctor yells. The Doctor covers their retreat by holding up the satellite dish as a shield as the Dalek fires. They climb back through the stairwell.

—

The Doctor stands on the ladder and uses the sonic screwdriver to seal the hatch. River has her gun aimed at it, just in case.

"Doctor, come on." River urges.

"Shh. It's moving away, finding another way in." He climbs down the ladder. "It needs to restore its power before it can attack again. Now, that means we've got exactly," he checks his watch, "four and a half minutes before it's at lethal capacity." He continues downstairs past them.

"How do you know?" Rory asks.

The Doctor pauses. "Because that's when it's due to kill me." Kathy remembers that the comment isn't the whole truth.

River whips round in alarm. "Kill you? What do you mean, kill you?" She looks at Kathy in alarm. Kathy shakes her head to indicate no questions as they all follow the Doctor.

"Oh, shut up, never mind. How can that Dalek even exist?" The Doctor moves into the hallway. "It was erased from time and then it came back. How?"

"You said the light from the Pandorica..." Rory reminds him. They reach the exhibit hall.

"It's not a light, it's a restoration field, but never mind. Call it a light. That light brought Amy back," the Doctor stops causing the rest of them to as well, "but how could it bring back a Dalek when the Daleks have never existed?"

"Do tell great maestro." Kathy says dramatically. River smirks and shakes her head.

"When the TARDIS blew up, it caused a total event collapse. A time explosion. It blasted every atom in every moment of the universe. Except..." the Doctor trails off.

"Except inside the Pandorica." Amy slowly realises.

"The perfect prison." The Doctor continues. "Inside it, perfectly preserved, a few billion atoms of the universe as it was. In theory, you could extrapolate the whole universe from a single one of them, like cloning a body from a single cell. And we've got the bumper family pack."

Rory shakes his head. "No, too fast, I'm not getting it."

"The box contains what the universe used to be, and the light thingy transmits it." Kathy explains.

"Yes! And that's how we're going to do it." The Doctor exclaims.

"Do what?" Amy questions.

"Relight the fire. Reboot the universe. Come on!" He continues on. Kathy and River catch up to the Doctor in the museum hallway with Rory and Amy trailing behind.

"Doctor, you're being completely ridiculous." River reprimands. "The Pandorica partially restored one Dalek. If it can't even reboot a single life form properly, how will it reboot the whole of reality?"

The Doctor stops. "What if we give it a moment of infinite power? Transmit the light from the Pandorica to every particle of space and time simultaneously?"

"Well, that would be lovely, dear, but we can't, because it's completely impossible." River says.

"You're wrong, River." Kathy pipes up.

"Exactly, you see, it's not." He taps River on the forehead. "It's ALMOST completely impossible. One spark is all we need."

"For what?" River asks.

The Doctor whispers. "Big Bang Two! Now listen..." The Doctor is shot by the Dalek and falls to the floor.

The Dalek trundles down the hall. "Exterminate! Exterminate!"

River is at the Doctor's side while Kathy stands there in shock; she hasn't seen some shot by a Dalek in person before. Rory takes Amy out of the way. "Get back. River, Kathy, get back now!"

"Exterminate!" Rory fires through his gun hand at the Dalek and it is drained of energy.

"Doctor. Doctor, it's me, River. Can you hear me? What is it? What do you need" Struggling, the Doctor activates the manipulator and disappears. "Where did he go?" River stands. "Damn it, he could be anywhere."

"He went downstairs. 12 minutes ago." Amy tells her solemnly.

"Show me!" River yells.

"River, he died."

"Technically no." Kathy says.

Before anyone can question her, the Dalek speaks, "Systems restoring! You will be exterminated!"

"We've got to move. That thing's coming back to life." Rory says.

"You go to the Doctor. I'll be right with you." Amy and Rory leave. Kathy pauses. "You too Kathy."

"But—"

"Please. I'll be fine."

Kathy reluctantly nods and follows Rory and Amy.

—

Kathy, Amy and Rory arrive on the stairs where the latter two had left the Doctor's "body". Rory's jacket is there, but no body.

"How could he have moved? He was dead!" Rory runs down the stairs yelling, "Doctor? Doctor!"

"But he was dead!" Amy protests.

"Yeah but who told you that?" Kathy remarks. River joins them.

"He did."

River walks calmly down the stairs. "Rule one. The Doctor lies."

"Where's the Dalek?" Amy questions.

"It died."

—

Kathy, River, Amy and Rory make their way through the exhibit hall. Ahead of them, Kathy sees the Doctor inside the Pandorica in the room ahead.

"Doctor!" Amy tells as they rush over to him. Rory and Amy stop while River and Kathy go to check on the Doctor. He was slumped and unconscious.

"Why did he tell us he was dead?" Rory questions.

"We were a diversion. Long as the Dalek was chasing us, he could work down here." Amy concludes.

"Exactly." Kathy says nodding to Amy. The redhead smiles.

"Doctor, can you hear me? What were you doing?" River demands, cradling his face.

"What's happening?" Rory asks and Kathy steps out to see the "sun" is closer, brighter through the window in the ceiling. She also sees that the displays are empty around them and in the exhibit hall. They needed to get moving.

"Reality's collapsing. It's speeding up. Look at this room." River explains. Amy and Rory begin to look around and notice themselves.

"Where did everything go?" Amy asks.

"History is being erased, nothing happened. Ever. We don't have much time." Kathy explains.

River turns back to the Doctor, trying to wake him. "Doctor, what were you doing? Tell us! Doctor?"

The Doctor slowly comes to. "Big... Bang... Two."

"The Big Bang. That's the beginning of the universe, right?" Rory says.

"What, and Big Bang Two is the bang that brings it back? Is that what you mean?" Amy asks. The Doctor gives a small nod.

"He's preparing the Pandorica to go into the TARDIS." Kathy adds. Might as well just point blank tell them.

"Oh!" River realises the plan.

"What does that mean? What will it do?" Amy asks again.

"The TARDIS is still burning and is the centre of the explosion of every point in history. So throwing the Pandorica into the explosion with the light…" Kathy trails off in her explanation.

"Will what?" Amy questions.

"The light from the Pandorica would explode everywhere at once, just like he said." River concludes.

"That would work? That would bring everything back?"

"It's a restoration field and the TARDIS, which is exploding at every point in history, will power it." Kathy finishes.

"Oh, that's brilliant. It might even work!" River exclaims. She pulls out the sonic screwdriver and runs it along the wires. "He's wired the vortex manipulator to the rest of the box."

"Why?" Amy asks.

"So he can take it with him. He's going to fly the Pandorica into the heart of the explosion." River realises.

The sky becomes a brilliant orange as Kathy and River help the Doctor finalise the Pandorica. Amy and Rory are standing together, just watching.

"Don't know me too well right now, do you?" The Doctor murmurs to Kathy.

"Only had a handful of meetings." She answers simply as she doesn't want to give anything away. River glances at her sadly before carrying on with what she is doing, giving them a semblance of privacy.

"You will still get to see many wonderful things."

"So will you." Kathy insists.

"I'll be on the wrong side. I won't exist." He argues. Kathy feels like there's more to what he's saying by the look he gives her. More than what she knows.

"You will." Kathy counters. "You just need the mind of a brilliant red head that waited."

He nods. "I need to speak with Amy."

River and Kathy come out of the Pandorica. Amy and Rory are hugging.

"Amy... He wants to talk to you." River tells her.

"So, what happens here? Big Bang Two? What happens to us?" Amy asks sniffing.

"We all wake up where we ought to be. None of this ever happens and we don't remember it." River answers. Kathy knows that the River they know won't exist without the Doctor though she'll be able to cling on long enough to give Amy the book.

"River, Kathy... tell me he comes back, too."

"The Doctor will be the heart of the explosion." Kathy says.

"So?"

"So all the cracks in time will close, but he'll be on the wrong side... Trapped in the void between the universes. Every memory of him will disappear from the universe as he will never have been born." Kathy explains. "Please Amy, he wants to talk to you before that happens."

"Not to either of you?"

"We've talked." Kathy replies.

"And he doesn't really know me yet. Now he never will." Kathy sees she's hurt by this and puts her arm around her.

Amy walks slowly to the Pandorica. "Hi."

The Doctor replies weakly, "Amy Pond. The girl who waited. All night in your garden. Was it worth it?"

"Shut up. Of course it was." Amy snaps.

"You asked me why I was taking you with me and I said..."No reason". I was lying." The Doctor prompts.

Kathy remembers she had found a doll of herself in Tudor wear so she knows it's going to happen to her in a couple hundred years. She walks away fearing she'll hear too many spoilers. The ground shakes after a couple of minutes.

"Doctor! It's speeding up!" River cries.

Amy places the sonic screwdriver in his pocket.

"There's going to be a very big bang. Big Bang Two. Try and remember your family and they'll be there." The Doctor says to her.

"How can I remember them if they never existed?" Amy asks.

"Because... you're special. That crack in your wall, all that time, the universe pouring into your head. You brought Rory back... you can bring them back, too. You just remember, and they'll be there." Yeah and we never see them again after this episode.

Amy backs away. "You won't."

"You'll have your family back. You won't need your imaginary friend any more." The Doctor laughs weakly. "Amy Pond... crying over me, eh? Guess what?"

"What?"

"Gotcha." Kathy smiles tearfully as she watches.

The Pandorica closes. Amy walks slowly backwards, not taking her eyes from the Pandorica, even as it begins to glow.

"Back! Get back!" River pushes Amy out of the way. The Pandorica launches into the sky.

Kathy, River, Rory and Amy are sitting on the floor against a wall as they watch the Pandorica shoot further into the sky.

River receives the message on her communicator. "It's from the Doctor." She looks skyward.

"What does it say?" Amy asks.

"Geronimo." Kathy replies without looking.

The Pandorica shoots on its collision course with the TARDIS. When the TARDIS and Pandorica meet, space explodes. And, just as suddenly, time reverses.

—

Next thing Kathy knows is her waking up and seeing a bright blue sky above her. Where is she?

"Kathy!" Kathy turns to the voice to see River running over to her. She sees she's in a field.

"You're okay, you will be okay." River wraps her in a tight hug. Why is River so worried? She looks over Ricer's shoulder to see what she thinks is Leadworth in the distance.

"What do you mean River?" Kathy asks.

River pulls back. "I gave Amy my diary that is now blank. It'll help her remember so the Doctor will return soon."

Oh right of course. Though Kathy is mildly miffed that River hadn't answered her question, she brushes it under the rug. "Are they having the reception yet?"

River shakes her head. "Not yet, they're still in the church but will be out soon."

Kathy nods. "Good." She then gives River a smirk. "Are you going to the reception or will I be heading over on my own?"

River laughs. "You know the answer. I'll hover outside but you can join me later."

Kathy stands and looks down at what she's wearing. The leggings, top and jacket she's currently wearing don't exactly scream wedding. "I'll need something to wear."

"Already sorted." River winks. She holds out a floor length blue dress with short sleeves.

—

Kathy waits outside the reception hall all done up and waiting to make her entrance once the Doctor returns and everyone remembers.

She hears Amy begin yelling to her father to shut up.

"Sorry. Sorry, everyone. But when I was a kid, I had two imaginary friends. The raggedy Doctor and tattered Kathy. My raggedy Doctor and tattered Kathy. But they weren't imaginary. They were real. I remember you! I remember! I brought the others back, I can bring you home, too. Raggedy man and tattered woman, I remember you, and you are late for my wedding!" Amy finishes.

Well, nice to know how important she is to Amy but also less pleasing is her name.

In the silence, Kathy hears the glasses start to tinkle against each other as the ground starts to shake.

"I found you. I found you in words, like you knew I would. That's why you told me the story... the brand new, ancient blue box. Oh, clever. Very clever." The wind begins to blow and Kathy hears the TARDIS. "Something old. Something new. Something borrowed. Something blue."

The TARDIS noise indicating it's beginning to materialise is heard by Kathy and she hears when it fully lands.

"Hello, everyone. I'm one of Amy's imaginary friends, but I came anyway." The Doctor calls to everyone. Kathy excitedly waits for her entrance as she peaks into the room. The Doctor is wearing a top hat with white tie and tails with a white scarf loosely draped over his shoulders. The TARDIS sits in the middle of the dance floor.

Amy charges to him. "You absolutely, definitely may kiss the bride."

The Doctor plants a finger on Amy's puckered lips. "Amelia! From now on, I shall be leaving the... kissing duties to the brand new Mr Pond." He shakes Rory's hand.

"No, I'm not Mr Pond. That's not how it works." Rory corrects.

"Why not?" Kathy calls to them as she walks into the hall and past the tables of the guests so as to get to the trio in the middle.

"Kathy!" Amy wraps Kathy in a tight hug and Kathy laughs at her reaction.

"Right then, everyone. I'll move my box. You're going to need the space. I only came for the dancing." The Doctor disappears inside. The box dematerialises and all the guests continue to sit in their seats in shock.

"Good to see you Kathy." Rory says to her.

Kathy smiles at him. "You too. You both look brilliant." She then does a spin as she looks at the guests. "Hi everyone! I'm the other imaginary friend! So sorry I missed the ceremony but I am here to show off my amazing moves."

—

The party begins and Kathy is having a great time. Particularly when after the cake was cut, she shoved a slice into the Doctor's face.

They move onto the dance floor and Kathy tries to dance with the Doctor and Amy but she's too busy creasing over with laughter, along with the latter of the two, at the Doctor's own dance to Queen's "Crazy Little Thing Called Love".

"You're terrible. That is embarrassing!" Amy yells just as he does the giraffe move. Kathy snorts and joins in with doing that move because how could she not?

Amy's accusations don't keep the Doctor from teaching the dance to all the children at the reception.

"That's it. That's good. Keep it loose." The Doctor instructs.

"Yes, keep it high. High up." Kathy adds.

—

Kathy slips away from the party, after saying goodbye to Amy and Rory, to find River at the Pond house to get her trip home to the 14th century.

She arrives to hear River ask, "Did you dance? Well, you always dance at weddings, don't you?"

Kathy comes round the bushes to see the Doctor standing in front of the TARDIS with River in front of him.

"You tell me." The Doctor responds.

"Spoilers."

Kathy appears next to River. "Oh he danced."

The Doctor huffs and hands River her journal back. "The writing's all back, but I didn't peek."

"Thank you."

The Doctor gives back the vortex manipulator. "Are you married, River?"

River puts the vortex manipulator on. "Are you asking?"

Kathy tries to hold in her giggles. This scene is too funny.

"Yes."

"Yes."

The Doctor then realises how that could sound. "No, hang on. Did you think I was asking you to marry me, o-o-or asking if you were married?"

"Yes."

"No, but was that "yes", or "yes"?"

"Yes."

Kathy finally lets out her giggles. River gives her a smirk.

"River... who are you?" The Doctor finally asks.

"You're going to find out very soon now. And I'm sorry, but that's when everything changes." River says instead.

"Do you know?" The Doctor asks Kathy.

"A lot but not everything and what I do know well, spoilers." Kathy replies.

"Come on Kathy." River interrupts, holding out her arm.

Kathy sighs and links her arm with River. "Till the next time Doctor."

The Doctor smiles. "Till the next time Kathy."

River activates the vortex manipulator and they disappear.